bg: Bulgarian language
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✔ bg is a well-formed language code. 
✔ This seems to be a code for an actual language.
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MediaWiki core messages: 91.01 %: 3605 / 3961 messages
Most important messages: 100.0 %: 578 / 578 messages
Collection extension: 74.86 %: 131 / 175 messages
ProofreadPage extension: 47.57 %: 88 / 185 messages
Android Wikipedia app: 60.88 %: 1337 / 2196 messages
iOS Wikipedia app: 34.02 %: 615 / 1808 messages
Main extensions used by Wikimedia: 57.11 %: 4076 / 7137 messages
Most important messages: 100.0 %: 578 / 578 messages
Collection extension: 74.86 %: 131 / 175 messages
ProofreadPage extension: 47.57 %: 88 / 185 messages
Android Wikipedia app: 60.88 %: 1337 / 2196 messages
iOS Wikipedia app: 34.02 %: 615 / 1808 messages
Main extensions used by Wikimedia: 57.11 %: 4076 / 7137 messages
✔ This language code is available for general use in MediaWiki.
✔ This language is available for general use on Wikidata.